Mg deficiency?

hi all, appreciate if you guys have any advice...

specs:

6 autoflower, 4 red dwarf 2 white dwarf- buddha seeds
250w, soil, 3L pot- biogrow - biobloom
water: 6 to 6.5ph and 0.5~Ec.
day 41.
* pictures are 4 days ago

Like 16 days ago ago 1 red and 2 whites started yellowing a bit. i thought, ok time to feed, and gave them a biogrow mix with a 0.9 Ec value, 3 days after clean watering and then 3 days more biobloom to 0.9 and 3 days more and another clean watering. Long story short the yellowing continued. Here i took a bad desicion and opted to force the nitrogen and gave them a grow mix of 1.5 Ec. Two days later i opened the door and all was messed up.







Yellow leaves worsened and burns appeared, baad. I rush to wash the most affected of all, another one received foliar feed and another did nothing.


Then, in my search i found a guy who explained that this situation could occur using only biogrow and biobloom and it would be enough to fix the problem a magnesium punch. I looked for the simptoms and they fit. For me the problem was a little more complex giving the fact that the only ones that are yellowing have the same soil mix and the other ones have "red guano" which is bird crap (dont know the accurate translation) giving them enough Mg. Always thought that the micro elements where in the water or at least in enough quantity in the soil mix. Apparently not.

Have a theory tough. I think that the most affected ate all the biogrow that she could until Mg completly lacked and with the rest burned the leaves. The other ones hold on better and in general only yellowed, and this yellow thing is happening because the plants take the food and grows but they lacked the Mg to keep all things green

I did the rootwash 4 days ago, seemed to work, in the nit foliar feed yellow seems to have advanced a little also like the one that i did nothing.

Yesterday i got the salts and foliar feed with 1.5 Ec -lacking accurate information- today i gave them light grow (0.4), a pinch of mg (0.1) and a little K (0.2). Also take ec of runoff water and it marks 3.4 i think is a little high but nothing disastrous... even took that measure with the 1.3 ec water.

Really dont know what to think if this thing isnt mag def. Rootbound? likely, but yellowing started roughly third week of being in the 3l pot, and really kick in after the 1.5ec biogrow.

I dont think is ph, even though i dont have the soil value. Salt nutelock? really dont know.

well... any words of wisdom?

Bonus track full garden.

Usually, yellowing is from lack of N, but can also be from extreme overwatering.
It's not good to do several different things at the same time trying to fix a problem, unless you KNOW there are multiple problems, and you know exactly what you are doing, otherwise, you don't know what helped what, and what made something worse.
I think you're over thinking your situation, and making things difficult for yourself.
Keep your PH close to 6.5 if you're in soil, and give them a feed of your veg nutes for some N, and wait a couple days.View attachment 2731557

thx man...

but the thing that confuses me its that the yelloing started kickin heavy like 10 days after i put N to the water mix. I do control water ph but i dont know for sure if is exactly at 6.5 because is a drop test... i try to keep it around 6.5 but the real thing is between 6.2-6.7. And i dont overwater... if any i underwater. Second time i do things with this soil and second time the same problem haunts me, first time i try to patch it throwing N but didnt work out.

ow... and i got 3 sick babies and did 3 different things to see which one worked the best.

Ok, panic mode here...














Yellowing is obviously spreading, also burns... dont know what hell is going on. Mg seems not to work here... P deficiency??

they are automatics with 42 days old, transplant is recommended?? asuming there are 3 weeks left n the process

it would be enough to washup the other ones???

please help.

Flush then slowly introduce weak nutes

Your ph is off. Has to be. All the nutes were in there then lockout occured then you overdosed them. I agree with flushing them big time. Bakatare knows his shit big time. I would stop kneejerk reactions. I don't normally flush at all. I don't see another option in this case. If you can go out and buy FF Sledgehammer and Boomerang I would try them. Good luck bro.

Many thanks for the replys.

I flush the ones in trouble, now only waiting.

Never ever again use biobizz soil mix.